Fabric take-off device

Abstract

The fabric take-off device comprises a fabric take-off roller mounted to be movable transversely of its longitudinal axis and two associated rod-shaped fabric guide elements which are mounted on fixed axes for supplying the fabric to the take-off roller and for taking the fabric away from the roller. The fabric tension causes the take-off roller to be pressed against the two guide elements due to the movable mounting of the roller. This contact-pressure force increases automatically as the cloth tension increases. A very reliable fabric take-off is obtained without slipping of the fabric on the take-off roller. To avoid damage to the fabric, the take-off roller need not have a rough surface nor need any pins, but may have a relatively smooth surface made, for example, of plastics.

What is claimed is: 
     
       1. A fabric take-off device for a travelling web of a fabric, said device comprising a plurality of supports disposed across a given weaving width;   a pair of longitudinally elongated guide elements mounted on said supports in spaced relation to each other to define a gap of predetermined size therebetween, each said element extending across said weaving width on a fixed longitudinal axis for passage of the travelling web therearound with at least the upstream guide element being driveless; and   a take-off roller of a diameter greater than said size of said gap disposed between said guide elements relative to the travelling web for passage of the travelling web thereover, said roller being drivingly rotatable about a longitudinal axis thereof and freely movable transversely of said latter axis to define a nip with each said guide element for passage of the web therebetween.   
     
     
       2. A fabric take-off device as set forth in claim 1 wherein said take-off roller includes a joint at one end for connection to a drive to permit transverse movement of said roller. 
     
     
       3. A fabric take-off device as set forth in claim 1 which further comprises at least one common support having said guide elements mounted thereon. 
     
     
       4. A fabric take-off device as set forth in claim 1 wherein each support is of U-shape to define a pair of arms with one of said guide elements disposed on a respective arm and a recess between said arms with said roller disposed in said recess between said arms. 
     
     
       5. A fabric take-off device as set forth in claim 1 wherein each guide element is mounted for rotation in said supports. 
     
     
       6. A fabric take-off device as set forth in claim 1 wherein said take-off roller is disposed above said guide elements. 
     
     
       7. A fabric take-off device as set forth in claim 1 which further comprises an elongated bar disposed in abutment with said roller and a force-storage means biasing said bar towards said roller. 
     
     
       8. In a textile machine, the combination comprising a machine frame having a given weaving width and a plurality of supports disposed along said weaving width;   a transmission mounted on said machine frame for receiving a driving force from a main shaft; and   a fabric take-off device mounted on said machine frame, said device including a pair of drive-less elongated guide elements mounted on said supports in spaced relation to each other to define a gap of predetermined size therebetween, each said element extending across said weaving width on a fixed longitudinal axis for passage of a travelling web thereover, and a take-off roller of a diameter greater than said size of said gap disposed between said guide elements relative to the travelling web for passage of the travelling web thereover, said roller being connected to said transmission for rotation about a longitudinal axis thereof and for free movement transversely of said latter axis to define a nip with each said guide element for passage of the web therebetween.   
     
     
       9. A fabric take-off device as set forth in claim 8 wherein each said guide element is a roller disposed in a recess of a respective support. 
     
     
       10. The combination as set forth in claim 8 which further comprises a joint between said transmission and said roller to effect rotation of said roller and to permit transverse movements of said roller. 
     
     
       11. The combination as set forth in claim 8 which further comprises a means for forming a shed having a reed beat-up point at one end, and at least one guide roller for for the ravelling web between said beat-up point and said take-off device. 
     
     
       12. The combination as set forth in claim 11 wherein said guide roller is an opposed-pitch screw-threaded rotatably mounted rod for laterally stretching the travelling web. 
     
     
       13. The combination as set forth in claim 8 wherein said guide elements are freely rotatable. 
     
     
       14. The combination as set forth in claim 8 wherein said guide elements are fixedly mounted. 
     
     
       15. A fabric take-off device for a travelling web of a fabric, said device comprising a pair of longitudinally elongated guide elements disposed in spaced relation to each other to define a gap of predetermined size therebetween, each said element being disposed on a fixed longitudinal axis for passage of the travelling web thereover;   a take-off roller of a diameter greater than said size of said gap disposed between said guide elements relative to the travelling web for passage of the travelling web thereover, said roller being drivingly rotatable about a longitudinal axis thereof and freely movable transversely of said latter axis; and   an elongated bar disposed in abutment with said roller and a force-storage means biasing said bar towards said roller.   
     
     
       16. In a textile machine, the combination comprising a machine frame;   a transmission mounted on said machine frame for receiving a driving force from a main shaft; and   a fabric take-off device mounted on said machine frame, said device including a pair of fixedly mounted elongated guide elements disposed in spaced relation to each other to define a gap of predetermined size therebetween, each said element being disposed on a fixed longitudinal axis for passage of a travelling web thereover, and a take-off roller of a diameter greater than said size of said gap disposed between said guide elements relative to the travelling web for passage of the travelling web thereover, said roller being connected to said transmission for rotation about a longitudinal axis thereof and for free movement transversely of said latter axis to define a nip with each said guide element for passage of the web therebetween.